State whether the following statement is true or false:

The planets twinkle at night due to atmospheric refraction of light.

Which phenomenon makes us see the sun:

(a) a few minutes before actual sunrise?

(b) a few minutes after actual sunset?

Atmospheric refraction causes advance sunrise and delayed sunset. By how much time is:

(a) sunrise advanced?

(b) sunset delayed?

Name the phenomenon due to which the stars seem higher in the sky than they actually are.

Fill in the following blanks with suitable words:

We can see the sun about.............minutes before the actual sunrise and about.............minutes after the actual sunset because of atmospheric...............